April 2018 - ghc-devs

Why does the RTS run GC right before shutting down?
by Ömer Sinan Ağacan 06 Apr '18

06 Apr '18

Hi, I'm wondering why we run GC in this line: https://github.com/ghc/ghc/blob/master/rts/Schedule.c#L2670 I went back in commit history using git blame and found the commit that introduced that line (5638488ba28), but it didn't help. Does anyone know why we need that line? Thanks, Ömer

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[ANNOUNCE] GHC 8.4.2-rc1 now available
by Ben Gamari 05 Apr '18

05 Apr '18

Hello everyone, The GHC team is proud to announce the first release candidate of 8.4.2. the source distribution, binary distributions, and documentation are available at https://downloads.haskell.org/~ghc/8.4.2-rc1 This release follows so closely to 8.4.1 due to a number last-minute bug-fixes that didn't quite make it into 8.4.1. This includes fixes for: * #14705, the interpreter being broken on some systems * #14779, where the compiler produces invalid code when used with -g * #14891, where a selection of GHC testsuite cases fail on OS X * #5129, where the simplifier would incorrectly reorder evaluation in under some conditions. Since this is a relatively small bugfix release we are bypassing the alpha releases and moving right to the release candidate stage. If all goes well the final release will be cut next week. Happy testing Cheers, - Ben

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More windows
by Simon Peyton Jones 04 Apr '18

04 Apr '18

Tamar I've noticed that "sh" (which is invoked at lot by make etc) takes AGES to start up. At least I think it's 'sh' that is causing the delay. I think it's c:/msys64/usr/bin/sh.exe >From searching the web (eg https://www2.cs.duke.edu/csl/docs/unix_course/intro-60.html) it seems likely that it executes c:/msys64/etc/profile first. And If I put an 'echo' at the start and end of that file, they do seem to take place with a significant gap between them. I have not started sprinkling more echos, but does that ring any bells? Can I replace 'sh' with c:/msys64/usr/bin/bash.exe, which seems to be faster? (My evnt variable SHELL already points to bash.exe. ) And if so, how would I do that? An environment variable. Physically copy bash.exe to sh.exe? Or what? Thanks Simon

2 2

Perl locale
by Simon Peyton Jones 04 Apr '18

04 Apr '18

Hi Tamar One other thing happened to me when building GHC, very early. See below. I think the perl concerned is c:/msys64/usr/bin/perl. Any ideas? It seems non-fatal Thanks Simon perl: warning: Setting locale failed. perl: warning: Please check that your locale settings: LC_ALL = (unset), LANG = "ENG" are supported and installed on your system. perl: warning: Falling back to the standard locale ("C"). perl: warning: Setting locale failed. perl: warning: Please check that your locale settings: LC_ALL = (unset), LANG = "ENG" are supported and installed on your system. perl: warning: Falling back to the standard locale ("C"). perl: warning: Setting locale failed. perl: warning: Please check that your locale settings: LC_ALL = (unset), LANG = "ENG" are supported and installed on your system. perl: warning: Falling back to the standard locale ("C"). perl: warning: Setting locale failed. perl: warning: Please check that your locale settings: LC_ALL = (unset), LANG = "ENG" are supported and installed on your system. perl: warning: Falling back to the standard locale ("C"). perl: warning: Setting locale failed. perl: warning: Please check that your locale settings: LC_ALL = (unset), LANG = "ENG" are supported and installed on your system.

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8.5 build failure
by John Leo 03 Apr '18

03 Apr '18

Hi everyone, I pulled from head this morning and rebased my current work on it, and am getting a build error I've never seen before. I don't think it's due to any of my own changes, and everything built fine last time I tried just a couple days ago . I'd pulled both code and submodules. I did make clean, ./boot, ./configure, and then make. The last few lines of the output are below. This is on a Mac using GHC 8.2.2. Let me know if you need any more info. John "inplace/bin/ghc-stage1" -this-unit-id rts -shared -dynamic -dynload deploy -no-auto-link-packages -Lrts/dist/build -lffi -optl-Wl,-rpath -optl-Wl,@loader_path `cat rts/dist/libs.depend` rts/dist/build/Adjustor.thr_debug_dyn_o rts/dist/build/Arena.thr_debug_dyn_o rts/dist/build/Capability.thr_debug_dyn_o rts/dist/build/CheckUnload.thr_debug_dyn_o rts/dist/build/ClosureFlags.thr_debug_dyn_o rts/dist/build/Disassembler.thr_debug_dyn_o rts/dist/build/FileLock.thr_debug_dyn_o rts/dist/build/Globals.thr_debug_dyn_o rts/dist/build/Hash.thr_debug_dyn_o rts/dist/build/Hpc.thr_debug_dyn_o rts/dist/build/HsFFI.thr_debug_dyn_o rts/dist/build/Inlines.thr_debug_dyn_o rts/dist/build/Interpreter.thr_debug_dyn_o rts/dist/build/LdvProfile.thr_debug_dyn_o rts/dist/build/Libdw.thr_debug_dyn_o rts/dist/build/LibdwPool.thr_debug_dyn_o rts/dist/build/Linker.thr_debug_dyn_o rts/dist/build/Messages.thr_debug_dyn_o rts/dist/build/OldARMAtomic.thr_debug_dyn_o rts/dist/build/PathUtils.thr_debug_dyn_o rts/dist/build/Pool.thr_debug_dyn_o rts/dist/build/Printer.thr_debug_dyn_o rts/dist/build/ProfHeap.thr_debug_dyn_o rts/dist/build/ProfilerReport.thr_debug_dyn_o rts/dist/build/ProfilerReportJson.thr_debug_dyn_o rts/dist/build/Profiling.thr_debug_dyn_o rts/dist/build/Proftimer.thr_debug_dyn_o rts/dist/build/RaiseAsync.thr_debug_dyn_o rts/dist/build/RetainerProfile.thr_debug_dyn_o rts/dist/build/RetainerSet.thr_debug_dyn_o rts/dist/build/RtsAPI.thr_debug_dyn_o rts/dist/build/RtsDllMain.thr_debug_dyn_o rts/dist/build/RtsFlags.thr_debug_dyn_o rts/dist/build/RtsMain.thr_debug_dyn_o rts/dist/build/RtsMessages.thr_debug_dyn_o rts/dist/build/RtsStartup.thr_debug_dyn_o rts/dist/build/RtsSymbolInfo.thr_debug_dyn_o rts/dist/build/RtsSymbols.thr_debug_dyn_o rts/dist/build/RtsUtils.thr_debug_dyn_o rts/dist/build/STM.thr_debug_dyn_o rts/dist/build/Schedule.thr_debug_dyn_o rts/dist/build/Sparks.thr_debug_dyn_o rts/dist/build/Stable.thr_debug_dyn_o rts/dist/build/StaticPtrTable.thr_debug_dyn_o rts/dist/build/Stats.thr_debug_dyn_o rts/dist/build/StgCRun.thr_debug_dyn_o rts/dist/build/StgPrimFloat.thr_debug_dyn_o rts/dist/build/Task.thr_debug_dyn_o rts/dist/build/ThreadLabels.thr_debug_dyn_o rts/dist/build/ThreadPaused.thr_debug_dyn_o rts/dist/build/Threads.thr_debug_dyn_o rts/dist/build/Ticky.thr_debug_dyn_o rts/dist/build/Timer.thr_debug_dyn_o rts/dist/build/TopHandler.thr_debug_dyn_o rts/dist/build/Trace.thr_debug_dyn_o rts/dist/build/WSDeque.thr_debug_dyn_o rts/dist/build/Weak.thr_debug_dyn_o rts/dist/build/fs.thr_debug_dyn_o rts/dist/build/xxhash.thr_debug_dyn_o rts/dist/build/hooks/FlagDefaults.thr_debug_dyn_o rts/dist/build/hooks/LongGCSync.thr_debug_dyn_o rts/dist/build/hooks/MallocFail.thr_debug_dyn_o rts/dist/build/hooks/OnExit.thr_debug_dyn_o rts/dist/build/hooks/OutOfHeap.thr_debug_dyn_o rts/dist/build/hooks/StackOverflow.thr_debug_dyn_o rts/dist/build/sm/BlockAlloc.thr_debug_dyn_o rts/dist/build/sm/CNF.thr_debug_dyn_o rts/dist/build/sm/Compact.thr_debug_dyn_o rts/dist/build/sm/Evac.thr_debug_dyn_o rts/dist/build/sm/Evac_thr.thr_debug_dyn_o rts/dist/build/sm/GC.thr_debug_dyn_o rts/dist/build/sm/GCAux.thr_debug_dyn_o rts/dist/build/sm/GCUtils.thr_debug_dyn_o rts/dist/build/sm/MBlock.thr_debug_dyn_o rts/dist/build/sm/MarkWeak.thr_debug_dyn_o rts/dist/build/sm/Sanity.thr_debug_dyn_o rts/dist/build/sm/Scav.thr_debug_dyn_o rts/dist/build/sm/Scav_thr.thr_debug_dyn_o rts/dist/build/sm/Storage.thr_debug_dyn_o rts/dist/build/sm/Sweep.thr_debug_dyn_o rts/dist/build/eventlog/EventLog.thr_debug_dyn_o rts/dist/build/eventlog/EventLogWriter.thr_debug_dyn_o rts/dist/build/linker/CacheFlush.thr_debug_dyn_o rts/dist/build/linker/Elf.thr_debug_dyn_o rts/dist/build/linker/LoadArchive.thr_debug_dyn_o rts/dist/build/linker/M32Alloc.thr_debug_dyn_o rts/dist/build/linker/MachO.thr_debug_dyn_o rts/dist/build/linker/PEi386.thr_debug_dyn_o rts/dist/build/linker/SymbolExtras.thr_debug_dyn_o rts/dist/build/linker/elf_got.thr_debug_dyn_o rts/dist/build/linker/elf_plt.thr_debug_dyn_o rts/dist/build/linker/elf_plt_aarch64.thr_debug_dyn_o rts/dist/build/linker/elf_plt_arm.thr_debug_dyn_o rts/dist/build/linker/elf_reloc.thr_debug_dyn_o rts/dist/build/linker/elf_reloc_aarch64.thr_debug_dyn_o rts/dist/build/linker/elf_util.thr_debug_dyn_o rts/dist/build/posix/GetEnv.thr_debug_dyn_o rts/dist/build/posix/GetTime.thr_debug_dyn_o rts/dist/build/posix/Itimer.thr_debug_dyn_o rts/dist/build/posix/OSMem.thr_debug_dyn_o rts/dist/build/posix/OSThreads.thr_debug_dyn_o rts/dist/build/posix/Select.thr_debug_dyn_o rts/dist/build/posix/Signals.thr_debug_dyn_o rts/dist/build/posix/TTY.thr_debug_dyn_o rts/dist/build/Apply.thr_debug_dyn_o rts/dist/build/Compact.thr_debug_dyn_o rts/dist/build/Exception.thr_debug_dyn_o rts/dist/build/HeapStackCheck.thr_debug_dyn_o rts/dist/build/PrimOps.thr_debug_dyn_o rts/dist/build/StgMiscClosures.thr_debug_dyn_o rts/dist/build/StgStartup.thr_debug_dyn_o rts/dist/build/StgStdThunks.thr_debug_dyn_o rts/dist/build/Updates.thr_debug_dyn_o rts/dist/build/AutoApply.thr_debug_dyn_o -fPIC -dynamic -optc-DTHREADED_RTS -optc-DDEBUG -eventlog -O -H64m -Wall -Iincludes -Iincludes/dist -Iincludes/dist-derivedconstants/header -Iincludes/dist-ghcconstants/header -Irts -Irts/dist/build -DCOMPILING_RTS -DFS_NAMESPACE=rts -this-unit-id rts -dcmm-lint -DDTRACE -i -irts -irts/dist/build -Irts/dist/build -irts/dist/build/./autogen -Irts/dist/build/./autogen -O2 -Wcpp-undef -O0 -Wnoncanonical-monad-instances -o rts/dist/build/libHSrts_thr_debug-ghc8.5.20180403.dylib "inplace/bin/ghc-stage1" -this-unit-id rts -shared -dynamic -dynload deploy -no-auto-link-packages -Lrts/dist/build -lffi -optl-Wl,-rpath -optl-Wl,@loader_path `cat rts/dist/libs.depend` rts/dist/build/Adjustor.debug_dyn_o rts/dist/build/Arena.debug_dyn_o rts/dist/build/Capability.debug_dyn_o rts/dist/build/CheckUnload.debug_dyn_o rts/dist/build/ClosureFlags.debug_dyn_o rts/dist/build/Disassembler.debug_dyn_o rts/dist/build/FileLock.debug_dyn_o rts/dist/build/Globals.debug_dyn_o rts/dist/build/Hash.debug_dyn_o rts/dist/build/Hpc.debug_dyn_o rts/dist/build/HsFFI.debug_dyn_o rts/dist/build/Inlines.debug_dyn_o rts/dist/build/Interpreter.debug_dyn_o rts/dist/build/LdvProfile.debug_dyn_o rts/dist/build/Libdw.debug_dyn_o rts/dist/build/LibdwPool.debug_dyn_o rts/dist/build/Linker.debug_dyn_o rts/dist/build/Messages.debug_dyn_o rts/dist/build/OldARMAtomic.debug_dyn_o rts/dist/build/PathUtils.debug_dyn_o rts/dist/build/Pool.debug_dyn_o rts/dist/build/Printer.debug_dyn_o rts/dist/build/ProfHeap.debug_dyn_o rts/dist/build/ProfilerReport.debug_dyn_o rts/dist/build/ProfilerReportJson.debug_dyn_o rts/dist/build/Profiling.debug_dyn_o rts/dist/build/Proftimer.debug_dyn_o rts/dist/build/RaiseAsync.debug_dyn_o rts/dist/build/RetainerProfile.debug_dyn_o rts/dist/build/RetainerSet.debug_dyn_o rts/dist/build/RtsAPI.debug_dyn_o rts/dist/build/RtsDllMain.debug_dyn_o rts/dist/build/RtsFlags.debug_dyn_o rts/dist/build/RtsMain.debug_dyn_o rts/dist/build/RtsMessages.debug_dyn_o rts/dist/build/RtsStartup.debug_dyn_o rts/dist/build/RtsSymbolInfo.debug_dyn_o rts/dist/build/RtsSymbols.debug_dyn_o rts/dist/build/RtsUtils.debug_dyn_o rts/dist/build/STM.debug_dyn_o rts/dist/build/Schedule.debug_dyn_o rts/dist/build/Sparks.debug_dyn_o rts/dist/build/Stable.debug_dyn_o rts/dist/build/StaticPtrTable.debug_dyn_o rts/dist/build/Stats.debug_dyn_o rts/dist/build/StgCRun.debug_dyn_o rts/dist/build/StgPrimFloat.debug_dyn_o rts/dist/build/Task.debug_dyn_o rts/dist/build/ThreadLabels.debug_dyn_o rts/dist/build/ThreadPaused.debug_dyn_o rts/dist/build/Threads.debug_dyn_o rts/dist/build/Ticky.debug_dyn_o rts/dist/build/Timer.debug_dyn_o rts/dist/build/TopHandler.debug_dyn_o rts/dist/build/Trace.debug_dyn_o rts/dist/build/WSDeque.debug_dyn_o rts/dist/build/Weak.debug_dyn_o rts/dist/build/fs.debug_dyn_o rts/dist/build/xxhash.debug_dyn_o rts/dist/build/hooks/FlagDefaults.debug_dyn_o rts/dist/build/hooks/LongGCSync.debug_dyn_o rts/dist/build/hooks/MallocFail.debug_dyn_o rts/dist/build/hooks/OnExit.debug_dyn_o rts/dist/build/hooks/OutOfHeap.debug_dyn_o rts/dist/build/hooks/StackOverflow.debug_dyn_o rts/dist/build/sm/BlockAlloc.debug_dyn_o rts/dist/build/sm/CNF.debug_dyn_o rts/dist/build/sm/Compact.debug_dyn_o rts/dist/build/sm/Evac.debug_dyn_o rts/dist/build/sm/Evac_thr.debug_dyn_o rts/dist/build/sm/GC.debug_dyn_o rts/dist/build/sm/GCAux.debug_dyn_o rts/dist/build/sm/GCUtils.debug_dyn_o rts/dist/build/sm/MBlock.debug_dyn_o rts/dist/build/sm/MarkWeak.debug_dyn_o rts/dist/build/sm/Sanity.debug_dyn_o rts/dist/build/sm/Scav.debug_dyn_o rts/dist/build/sm/Scav_thr.debug_dyn_o rts/dist/build/sm/Storage.debug_dyn_o rts/dist/build/sm/Sweep.debug_dyn_o rts/dist/build/eventlog/EventLog.debug_dyn_o rts/dist/build/eventlog/EventLogWriter.debug_dyn_o rts/dist/build/linker/CacheFlush.debug_dyn_o rts/dist/build/linker/Elf.debug_dyn_o rts/dist/build/linker/LoadArchive.debug_dyn_o rts/dist/build/linker/M32Alloc.debug_dyn_o rts/dist/build/linker/MachO.debug_dyn_o rts/dist/build/linker/PEi386.debug_dyn_o rts/dist/build/linker/SymbolExtras.debug_dyn_o rts/dist/build/linker/elf_got.debug_dyn_o rts/dist/build/linker/elf_plt.debug_dyn_o rts/dist/build/linker/elf_plt_aarch64.debug_dyn_o rts/dist/build/linker/elf_plt_arm.debug_dyn_o rts/dist/build/linker/elf_reloc.debug_dyn_o rts/dist/build/linker/elf_reloc_aarch64.debug_dyn_o rts/dist/build/linker/elf_util.debug_dyn_o rts/dist/build/posix/GetEnv.debug_dyn_o rts/dist/build/posix/GetTime.debug_dyn_o rts/dist/build/posix/Itimer.debug_dyn_o rts/dist/build/posix/OSMem.debug_dyn_o rts/dist/build/posix/OSThreads.debug_dyn_o rts/dist/build/posix/Select.debug_dyn_o rts/dist/build/posix/Signals.debug_dyn_o rts/dist/build/posix/TTY.debug_dyn_o rts/dist/build/Apply.debug_dyn_o rts/dist/build/Compact.debug_dyn_o rts/dist/build/Exception.debug_dyn_o rts/dist/build/HeapStackCheck.debug_dyn_o rts/dist/build/PrimOps.debug_dyn_o rts/dist/build/StgMiscClosures.debug_dyn_o rts/dist/build/StgStartup.debug_dyn_o rts/dist/build/StgStdThunks.debug_dyn_o rts/dist/build/Updates.debug_dyn_o rts/dist/build/AutoApply.debug_dyn_o -fPIC -dynamic -optc-DDEBUG -ticky -DTICKY_TICKY -eventlog -O -H64m -Wall -Iincludes -Iincludes/dist -Iincludes/dist-derivedconstants/header -Iincludes/dist-ghcconstants/header -Irts -Irts/dist/build -DCOMPILING_RTS -DFS_NAMESPACE=rts -this-unit-id rts -dcmm-lint -DDTRACE -i -irts -irts/dist/build -Irts/dist/build -irts/dist/build/./autogen -Irts/dist/build/./autogen -O2 -Wcpp-undef -O0 -Wnoncanonical-monad-instances -o rts/dist/build/libHSrts_debug-ghc8.5.20180403.dylib "inplace/bin/ghc-stage1" -hisuf hi -osuf o -hcsuf hc -static -O -H64m -Wall -this-unit-id ghc-prim-0.5.2.0 -hide-all-packages -i -ilibraries/ghc-prim/. -ilibraries/ghc-prim/dist-install/build -Ilibraries/ghc-prim/dist-install/build -ilibraries/ghc-prim/dist-install/build/./autogen -Ilibraries/ghc-prim/dist-install/build/./autogen -Ilibraries/ghc-prim/. -optP-include -optPlibraries/ghc-prim/dist-install/build/./autogen/cabal_macros.h -package-id rts -this-unit-id ghc-prim -XHaskell2010 -O -dcore-lint -no-user-package-db -rtsopts -Wno-trustworthy-safe -Wno-deprecated-flags -Wnoncanonical-monad-instances -odir libraries/ghc-prim/dist-install/build -hidir libraries/ghc-prim/dist-install/build -stubdir libraries/ghc-prim/dist-install/build -dynamic-too -c libraries/ghc-prim/./GHC/CString.hs -o libraries/ghc-prim/dist-install/build/GHC/CString.o -dyno libraries/ghc-prim/dist-install/build/GHC/CString.dyn_o "inplace/bin/ghc-stage1" -hisuf hi -osuf o -hcsuf hc -static -O -H64m -Wall -this-unit-id ghc-prim-0.5.2.0 -hide-all-packages -i -ilibraries/ghc-prim/. -ilibraries/ghc-prim/dist-install/build -Ilibraries/ghc-prim/dist-install/build -ilibraries/ghc-prim/dist-install/build/./autogen -Ilibraries/ghc-prim/dist-install/build/./autogen -Ilibraries/ghc-prim/. -optP-include -optPlibraries/ghc-prim/dist-install/build/./autogen/cabal_macros.h -package-id rts -this-unit-id ghc-prim -XHaskell2010 -O -dcore-lint -no-user-package-db -rtsopts -Wno-trustworthy-safe -Wno-deprecated-flags -Wnoncanonical-monad-instances -odir libraries/ghc-prim/dist-install/build -hidir libraries/ghc-prim/dist-install/build -stubdir libraries/ghc-prim/dist-install/build -dynamic-too -c libraries/ghc-prim/./GHC/IntWord64.hs -o libraries/ghc-prim/dist-install/build/GHC/IntWord64.o -dyno libraries/ghc-prim/dist-install/build/GHC/IntWord64.dyn_o "inplace/bin/ghc-stage1" -hisuf hi -osuf o -hcsuf hc -static -O -H64m -Wall -this-unit-id base-4.11.0.0 -hide-all-packages -i -ilibraries/base/. -ilibraries/base/dist-install/build -Ilibraries/base/dist-install/build -ilibraries/base/dist-install/build/./autogen -Ilibraries/base/dist-install/build/./autogen -Ilibraries/base/include -Ilibraries/base/dist-install/build/include -optP-DOPTIMISE_INTEGER_GCD_LCM -optP-include -optPlibraries/base/dist-install/build/./autogen/cabal_macros.h -package-id ghc-prim-0.5.2.0 -package-id integer-gmp-1.0.1.0 -package-id rts -this-unit-id base -XHaskell2010 -O -dcore-lint -no-user-package-db -rtsopts -Wno-trustworthy-safe -Wno-deprecated-flags -Wnoncanonical-monad-instances -odir libraries/base/dist-install/build -hidir libraries/base/dist-install/build -stubdir libraries/base/dist-install/build -dynamic-too -c libraries/base/./GHC/Base.hs-boot -o libraries/base/dist-install/build/GHC/Base.o-boot -dyno libraries/base/dist-install/build/GHC/Base.dyn_o-boot "inplace/bin/ghc-stage1" -hisuf hi -osuf o -hcsuf hc -static -O -H64m -Wall -this-unit-id base-4.11.0.0 -hide-all-packages -i -ilibraries/base/. -ilibraries/base/dist-install/build -Ilibraries/base/dist-install/build -ilibraries/base/dist-install/build/./autogen -Ilibraries/base/dist-install/build/./autogen -Ilibraries/base/include -Ilibraries/base/dist-install/build/include -optP-DOPTIMISE_INTEGER_GCD_LCM -optP-include -optPlibraries/base/dist-install/build/./autogen/cabal_macros.h -package-id ghc-prim-0.5.2.0 -package-id integer-gmp-1.0.1.0 -package-id rts -this-unit-id base -XHaskell2010 -O -dcore-lint -no-user-package-db -rtsopts -Wno-trustworthy-safe -Wno-deprecated-flags -Wnoncanonical-monad-instances -odir libraries/base/dist-install/build -hidir libraries/base/dist-install/build -stubdir libraries/base/dist-install/build -dynamic-too -c libraries/base/./GHC/Real.hs-boot -o libraries/base/dist-install/build/GHC/Real.o-boot -dyno libraries/base/dist-install/build/GHC/Real.dyn_o-boot "inplace/bin/ghc-stage1" -hisuf hi -osuf o -hcsuf hc -static -O -H64m -Wall -this-unit-id base-4.11.0.0 -hide-all-packages -i -ilibraries/base/. -ilibraries/base/dist-install/build -Ilibraries/base/dist-install/build -ilibraries/base/dist-install/build/./autogen -Ilibraries/base/dist-install/build/./autogen -Ilibraries/base/include -Ilibraries/base/dist-install/build/include -optP-DOPTIMISE_INTEGER_GCD_LCM -optP-include -optPlibraries/base/dist-install/build/./autogen/cabal_macros.h -package-id ghc-prim-0.5.2.0 -package-id integer-gmp-1.0.1.0 -package-id rts -this-unit-id base -XHaskell2010 -O -dcore-lint -no-user-package-db -rtsopts -Wno-trustworthy-safe -Wno-deprecated-flags -Wnoncanonical-monad-instances -odir libraries/base/dist-install/build -hidir libraries/base/dist-install/build -stubdir libraries/base/dist-install/build -dynamic-too -c libraries/base/./GHC/IO.hs-boot -o libraries/base/dist-install/build/GHC/IO.o-boot -dyno libraries/base/dist-install/build/GHC/IO.dyn_o-boot libraries/base/GHC/IO.hs-boot:9:12: error: • Failed to load interface for ‘GHC.Integer.Type’ There are files missing in the ‘integer-gmp-1.0.1.0’ package, try running 'ghc-pkg check'. Use -v to see a list of the files searched for. • In the type signature: mplusIO :: IO a -> IO a -> IO a | 9 | mplusIO :: IO a -> IO a -> IO a | ^^^^^^^^^^^^^^^^^^^^ make[1]: *** [libraries/base/dist-install/build/GHC/IO.o-boot] Error 1 make[1]: *** Waiting for unfinished jobs.... make: *** [all] Error 2

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Building GHC using cabal repl
by Joachim Breitner 03 Apr '18

03 Apr '18

Hi, when hacking on most Haskell projects these days, I enjoy having a shell with ghcid -c 'cabal new-repl -w ghc-8.2' open. I wondered if I can achieve the same when hacking on GHC. The compiler/ directory has a Cabal file. It does not work out-of-the box (in a fully built tree): $ cabal new-repl -w ../inplace/bin/ghc-stage2 -fstage2 Build profile: -w ghc-8.5.20180320 -O1 In order, the following will be built (use -v for more details): - ghc-8.5 (lib) (first run) Preprocessing library for ghc-8.5.. cabal: can't find source for Config in backpack, basicTypes, cmm, codeGen, coreSyn, deSugar, ghci, hsSyn, iface, llvmGen, main, nativeGen, parser, prelude, profiling, rename, simplCore, simplStg, specialise, stgSyn, stranal, typecheck, types, utils, vectorise, /home/jojo/build/haskell/ghc/compiler/dist-newstyle/build/x86_64-linux/ghc-8.5.20180320/ghc-8.5/build/autogen, /home/jojo/build/haskell/ghc/compiler/dist-newstyle/build/x86_64-linux/ghc-8.5.20180320/ghc-8.5/build/global-autogen cabal: repl failed for ghc-8.5. It seems that the stage2/build directory is not registered as a source directory: $ find -name Config.hs ./stage2/build/Config.hs ./stage1/build/Config.hs But if I extend the section if flag(stage2) Include-Dirs: stage2 with these lines Include-Dirs: stage2/build hs-source-dirs: stage2/build ghc-options: -DSTAGE=2 ghc-options: -fobject-code and call cabal like so, it actually works: cabal new-repl -w ../inplace/bin/ghc-stage2 -fstage2 If I now make hdevtools use this line, then hacking on GHC will have a bit less friction… (BTW, does Hadrian have a “load all of GHC in GHCi” mode?) Cheers, Joachim -- Joachim “nomeata” Breitner mail(a)joachim-breitner.de https://www.joachim-breitner.de/

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[Newcomer] [Bug 13795] :kind! is not expanding type synonyms anymore
by Xing GUO 03 Apr '18

03 Apr '18

Hi, I am a newcomer, I have compiled the GHC codes ... And, I want to do some contribution for it ... I found a ticket on the website, and I want to work on this ... #BUG 13795 <https://ghc.haskell.org/trac/ghc/ticket/13795> Can someone give me some advice? or is there anyone that has been working on this ? Regards, Xing

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T7050 failing
by Richard Eisenberg 02 Apr '18

02 Apr '18

Hi Simon, Your recent "unpack datacons" patch (https://phabricator.haskell.org/rGHC9187d5fb1d3d38a4e607b0d61784c21447c8195b <https://phabricator.haskell.org/rGHC9187d5fb1d3d38a4e607b0d61784c21447c8195b>) causes typecheck/should_compile/T7050 to loop. This was harder to discover because I had broken validation previously... Richard

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Testsuite failures
by Simon Peyton Jones 02 Apr '18

02 Apr '18

Ben I'm getting these unexpected failures on my Linux box (64 bit) Unexpected failures: /tmp/ghctest-g01j3x6z/test spaces/./cabal/ghcpkg05.run ghcpkg05 [bad stderr] (normal) Unexpected stat failures: /tmp/ghctest-g01j3x6z/test spaces/./perf/compiler/T5837.run T5837 [stat too good] (normal) /tmp/ghctest-g01j3x6z/test spaces/./perf/compiler/T5321FD.run T5321FD [stat too good] (normal) I would LOVE it if the testsuite framework didn't print those long prefix paths! I'd prefer Unexpected failures: cabal/ghcpkg05.run ghcpkg05 [bad stderr] (normal) Unexpected stat failures: perf/compiler/T5837.run T5837 [stat too good] (normal) perf/compiler/T5321FD.run T5321FD [stat too good] (normal) The stat failures look like this: =====> T5321FD(normal) 1 of 1 [0, 0, 0] cd "./T5321FD.run" && "/5playpen/simonpj/HEAD-1/inplace/test spaces/ghc-stage2" -c T5321FD.hs -no-user-package-db -rtsopts -fno-warn-missed-specialisations -fshow-warning-groups -fdiagnostics-color=never -fno-diagnostics-show-caret -dno-debug-output +RTS -V0 -tT5321FD.comp.stats --machine-readable -RTS bytes allocated value is too low: (If this is because you have improved GHC, please update the test so that GHC doesn't regress again) Expected T5321FD(normal) bytes allocated: 415136648 +/-10% Lower bound T5321FD(normal) bytes allocated: 373622983 Upper bound T5321FD(normal) bytes allocated: 456650313 Actual T5321FD(normal) bytes allocated: 373272448 Deviation T5321FD(normal) bytes allocated: -10.1 % *** unexpected stat test failure for T5321FD(normal) =====> T5837(normal) 1 of 1 [0, 0, 0] cd "./T5837.run" && "/5playpen/simonpj/HEAD-1/inplace/test spaces/ghc-stage2" -c T5837.hs -no-user-package-db -rtsopts -fno-warn-missed-specialisations -fshow-warning-groups -fdiagnostics-color=never -fno-diagnostics-show-caret -dno-debug-output -freduction-depth=50 +RTS -V0 -tT5837.comp.stats --machine-readable -RTS bytes allocated value is too low: (If this is because you have improved GHC, please update the test so that GHC doesn't regress again) Expected T5837(normal) bytes allocated: 55813608 +/-7% Lower bound T5837(normal) bytes allocated: 51906655 Upper bound T5837(normal) bytes allocated: 59720561 Actual T5837(normal) bytes allocated: 51558808 Deviation T5837(normal) bytes allocated: -7.6 % *** unexpected stat test failure for T5837(normal) In both cases, just a bit past the threshold. What is odd is that the latter doesn't fail on our CI system (I asked you this before). The former is new, maybe to do with Richard's recent patches. Question: are the numbers 'centred' for the CI infrastructure. Maybe they are just under 10% and 7% resp, and something local pushes them a tiny bit lower? The ghcpkg05 failure is quite consistent, despite from-clean rebuild. =====> ghcpkg05(normal) 1 of 1 [0, 0, 0] cd "./ghcpkg05.run" && $MAKE -s --no-print-directory ghcpkg05 Actual stderr output differs from expected: diff -uw "./ghcpkg05.run/ghcpkg05.stderr.normalised" "./ghcpkg05.run/ghcpkg05.run.stderr.normalised" --- ./ghcpkg05.run/ghcpkg05.stderr.normalised 2018-04-02 11:52:51.407023104 +0100 +++ ./ghcpkg05.run/ghcpkg05.run.stderr.normalised 2018-04-02 11:52:51.407023104 +0100 @@ -10,6 +10,13 @@ cannot find any of ["C/D.hi","C/D.p_hi","C/D.dyn_hi"] cannot find any of ["C/E.hi","C/E.p_hi","C/E.dyn_hi"] cannot find any of ["libtestpkg-2.0-XXX.a","libtestpkg-2.0-XXX.p_a","libtestpkg-2.0-XXX-ghc<VERSION>.so","libtestpkg-2.0-XXX-ghc<VERSION>.dylib","testpkg-2.0-XXX-ghc<VERSION>.dll"] on library path +Warning: include-dirs: /5playpen/simonpj/HEAD-1/compiler/stage2/build/utils doesn't exist or isn't a directory +Warning: include-dirs: /5playpen/simonpj/HEAD-1/compiler/stage2/build/../rts/dist/build doesn't exist or isn't a directory +Warning: include-dirs: /5playpen/simonpj/HEAD-1/compiler/stage2/build/stage2 doesn't exist or isn't a directory +Warning: include-dirs: /5playpen/simonpj/HEAD-1/libraries/haskeline/dist-install/build/includes doesn't exist or isn't a directory +Warning: include-dirs: /5playpen/simonpj/HEAD-1/libraries/text/dist-install/build/include doesn't exist or isn't a directory +Warning: include-dirs: /5playpen/simonpj/HEAD-1/libraries/containers/dist-install/build/include doesn't exist or isn't a directory +Warning: include-dirs: /5playpen/simonpj/HEAD-1/libraries/bytestring/dist-install/build/include doesn't exist or isn't a directory The following packages are broken, either because they have a problem listed above, or because they depend on a broken package. *** unexpected failure for ghcpkg05(normal) Any ideas? Thanks SImon

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Haskell Colonectomy
by John Leo 01 Apr '18

01 Apr '18

A serious proposal: https://github.com/halfaya/ghc-proposals/blob/master/proposals/0000-colonec… John

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